设全集是实数集R,A={x丨2x-7x+3≤0},B={x丨x+a<0}[1]当a=-4时,求A∩B和A∪B
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![设全集是实数集R,A={x丨2x-7x+3≤0},B={x丨x+a<0}[1]当a=-4时,求A∩B和A∪B](/uploads/image/z/3967021-37-1.jpg?t=%E8%AE%BE%E5%85%A8%E9%9B%86%E6%98%AF%E5%AE%9E%E6%95%B0%E9%9B%86R%2CA%3D%7Bx%E4%B8%A82x-7x%2B3%E2%89%A40%7D%2CB%3D%7Bx%E4%B8%A8x%2Ba%EF%BC%9C0%7D%5B1%5D%E5%BD%93a%3D-4%E6%97%B6%2C%E6%B1%82A%E2%88%A9B%E5%92%8CA%E2%88%AAB)
设全集是实数集R,A={x丨2x-7x+3≤0},B={x丨x+a<0}[1]当a=-4时,求A∩B和A∪B
设全集是实数集R,A={x丨2x-7x+3≤0},B={x丨x+a<0}[1]当a=-4时,求A∩B和A∪B
设全集是实数集R,A={x丨2x-7x+3≤0},B={x丨x+a<0}[1]当a=-4时,求A∩B和A∪B
第一个是(-2,2)第二个是(-2/9,8) 上高一了吧.
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